Campaign - Low Torque On Lifter Retainer Bolts
GMC NUMBER: 95-C-06GROUP: 6-Engine
DATE: September 1994
SUBJECT:
LOW TORQUE ON LIFTER RETAINER BOLTS
MODELS:
CERTAIN 1995 S PICKUPS EQUIPPED WITH 2.2L (LN2) ENGINES
General Motors has determined that CERTAIN 1995 S pickups may have been assembled with the lifter retainer bolts having low/zero torque applied to them. The bolts may continue to loosen and become lodged or make contact with other engine parts and/or allow the lifters to rotate in their bores causing damage to the face of the cam and/or lifter(s).
To correct this condition, dealers are to tighten both of the lifter retainer bolts to 11 Nm (97 lbs. in.). If bolt(s) loosened enough to cause engine damage, dealers are to replace the engine.
VEHICLES INVOLVED
Involved are CERTAIN 1995 S pickups built with the VINs as shown.
The specific vehicles involved in this campaign have been identified by Vehicle Identification Number (VIN) Computer Listings. These listings are furnished to all involved dealers with the campaign bulletin. Dealers should confirm vehicle eligibility through VISS (Vehicle Information Service System) or SERVICENET prior to beginning campaign repairs.
DEALER CAMPAIGN RESPONSIBILITY
All unsold vehicles in dealers' possession and subject to this campaign MUST be held and inspected/repaired per the service procedure of this campaign bulletin BEFORE owners take possession of these vehicles.
Dealers are to service all vehicles subject to this campaign at no charge to owners. regardless of mileage. age of vehicle. or ownership. from this time forward.
Owners of vehicles recently sold from your vehicle inventory are to be contacted by the dealer and arrangements made to make the required correction according to instructions contained in this bulletin.
In summary. whenever a vehicle subject to this campaign enters your vehicle inventory, or Is in your dealership for service In the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.
If the name and address of the owner of an involved vehicle was unavailable to GMC Truck Division at the time of campaign initiation. the dealer must determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.
GMC Truck Division
General Motors Corporation
101 Union Street
Plymouth, Michigan 48170
OWNER NOTIFICATION
Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of owner letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing may contain owner names and addresses obtained from State Motor Vehicle Registration records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to this campaign.
SERVICE PROCEDURE
Dealers will be provided with a special wrench by the engine manufacturing plant.
1. Remove intake air duct assembly.
2. Remove throttle. cruise. T.V. cable bracket, disconnect cables from throttle lever and position assembly aside.
3. Disconnect spark plug wires from plugs and position wires aside (Truck Models ONLY).
4. Disconnect any vacuum hoses connected to rocker arm cover.
5. Remove rocker arm cover.
6. Clean rocker arm cover and cylinder head mating surfaces. as necessary.
NOTE:
Rocker arm cover gasket is REUSABLE.
7. Access and tighten BOTH lifter retainer bolts to 11 Nm (97 lbs. in.)
NOTE:
The lifter retainer bolts cannot be easily viewed. Therefore. the bolt heads are accessed by feel. when fitting the special wrench onto the head of the bolt. Due to cylinder head gasket interference. downward force must be applied to the end of the wrench for positive wrench to bolt engagement. Due to limited turning space. the bolt can only he rotated approximately 1/8 turn at a time.
IMPORTANT:
UPON APPROACHING SPECIFIED TORQUE, ENSURE THAT TORQUE IS ACTUALLY ACCOMPLISHED RATHER THAN THE WRENCH POSSIBLY BEING STOPPED BY THE CYLINDER HEAD CASTING. (See Figures 1 & 2 to aid in accessing bolt heads with special wrench. As shown in Figure 1, the bolts are located between # 1 & 2 and # 3 & 4 intake runners, directly below the casting webs).
IMPORTANT:
IN THE BOLT HEADS CANNOT BE ACCESSED WITH THE PROVIDED WRENCH. THE BOLT(S) ARE EITHER MISSING OR LOOSENED EXCESSIVELY. IN EITHER CASE. ENGINE DAMAGE HAS PROBABLY OCCURRED AND THE ENGINE WILL NEED TO BE REPLACED UNDER THE ENGINE EXCHANGE PROGRAM.
8. Install rocker arm cover and torque bolts to 10 Nm (89 lbs. in.).
9. Connect vacuum hoses to rocker arm cover.
10. Connect spark plug wires (Truck Models ONLY).
11. Connect cables to throttle lever & Ins tall throttle, cruise, T.V. cable bracket assembly.
12. Install air cleaner and duct assembly to throttle body assembly.
13. Adjust T.V. cable, If necessary.
14. Apply the campaign identification label.
PARTS INFORMATION
To ensure that replacement parts your retail facility may require are obtained as soon as possible, order them from GM Service Parts Operations (GMSPO) on a C.I.O. order, with no special instructions, but order on an advise code 2.
WARRANTY INFORMATION
Dealers should submit a warranty claim on each vehicle completed under this campaign.
CAMPAIGN IDENTIFICATION LABEL
Each vehicle corrected in accordance with tile instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the campaign number and five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ball point pen.
Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.
Apply "Campaign Identification Label" only on a clean. dry surface.
ADMINISTRATIVE PROCEDURE
Procedures covering this campaign are outlined in Section V of your dealership's "GMC Truck Warranty Claims Processing Manual" # 9119 Rev. 2/94.
Dear GMC Truck Owner:
As a valued customer, your complete satisfaction with your GMC truck Is our goal. In keeping with this goal. we want to let you know that we have discovered a problem that could affect your vehicle and we want to take care of it at no charge to you.
A number of 1995 S pickups. such as yours. may have been assembled with the lifter retainer bolts having low/zero torque applied to them. This condition could result in the bolts continuing to loosen and becoming lodged or making contact with other engine parts and/or allowing the lifters to rotate in their bores causing damage to the face of the cam and/or lifter(s).
To correct this condition, dealers will inspect and tighten the lifter retainer bolts. If bolt(s) loosened enough to cause engine damage. your dealer will replace the engine.
If you have already encountered this condition and paid for all or part of the repair. you should contact your GMC Truck dealer. When requesting reimbursement. you should present the dealer with your original paid receipt. verifying expenses incurred for such repair.
Instructions for performing this service have been sent to your GMC Truck dealer, and parts are available. Please contact your GMC dealer to arrange a service date as soon as possible. This procedure will take about (time needed to perform service procedure)to complete. but you should ask how much additional time your dealer will need to schedule and process your vehicle.
The enclosed postage paid owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction to your vehicle In the shortest possible time. If you have sold or traded your vehicle, please furnish us the complete name and address of the person you sold or traded your vehicle to and return the card to us.
We are sorry to cause you this inconvenience: however, we have taken this action in the interest of your continued satisfaction with our product.